Upside Down Pyramid

I was trying to figure out my next project one night and someone in my family suggested a pyramid because my “city” area was being built in the desert.  I couldn’t bring myself to make just a run of the mill pyramid so I decided to build an upside down one instead.

I built it outside the walls of the city so I could look down on the monsters at night through the glass walls.  Of course I had to create an underground entrance to it from the main area so we could safely enter and exit anytime of day.  It’s made almost entirely out of glass block and sand stone slabs.  The corners are all netherrack which I’m still debating lighting up to see what it does.